 30 feet of sea level rise. That's enough to entirely submerge basically all of South Florida and Southern Louisiana, the entire Shanghai region, and more or less all the country of Bangladesh, not to mention completely destroy life in a number of island nations. It may take centuries, but it's going to happen. And I love how they couch it. Maybe, maybe more melt. But they do all of that doomsday scenario, end of the world stuff, 30 feet.